XML 15 R25.htm IDEA: XBRL DOCUMENT v2.4.0.6
Stock-based compensation (Details Textual) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Share-based Compensation $ 83,174 $ 124,891 $ 195,783 $ 201,767
Sale Of Stock, Price Per Share $ 8.29   $ 8.29  
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Non Vested, Outstanding, Number 116,574   116,574  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number 204,337   204,337  
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Non Vested, Outstanding, Weighted Average Exercise Price $ 10.55   $ 10.55  
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Vested and Expected To Vest, Outstanding, Weighted Average Exercise Price $ 15.10   $ 15.10  
Share Based Compensation Arrangement By Share Based Payment Award Options Non Vested Outstanding Weighted Average Remaining Contractual Term     3 years 11 months 5 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term     1 year 7 months 10 days  
Redeemable Preferred Stock [Member]
       
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized 150,645   150,645  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition     1 year 3 months 15 days  
Stock Option [Member]
       
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 260,324   $ 260,324  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition     3 years 11 months 4 days  
Stock Option [Member] | Redeemable Preferred Stock [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 10,033      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate 0.08%      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 29 days      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Weighted Average Volatility Rate 30.84%      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Weighted Average Expected Dividend 3.87%